Working with a new pulley system, some firefighters acted as the anchors, while two firefighters repelled down to find the pretend victim.

On a day where temperatures are some of the hottest of the year, there was a reason they were only wearing T-shirts instead of their standard jackets.

"This would be similar to someone putting on a winter coat, even a little bit heavier. It keeps us nice and warm in winter, but in summer it's not something we want to be in for a long time," North Shore firefighter Dan Tyk said.

The coat alone weighs an extra 20-30 pounds and traps in moisture.

Anytime firefighters train in temperatures above 90 degrees, they leave the heavy gear off. They also keep cool by hydrating with water, and to really cool their core, they have ice pops.

"When we train, we try to do it as safely as possible, so we have some extra precautions in place," Tyk said.

They are measures that help protect firefighters while they save your life.

When crews are fighting a fire in hot weather, the North Shore Fire Department told WISN 12 News it has someone assigned to make sure firefighters take breaks, hydrate and rotate every few minutes.